message: Implement getMmscInfoForReceptionAck properly

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.SharedPreferences;

import android.net.Uri;

import android.os.AsyncTask;

import android.preference.PreferenceManager;

import android.provider.Telephony;

import android.telephony.SmsManager;

import com.android.mms.service_alt.DownloadRequest;

    private static final ExecutorService RECEIVE_NOTIFICATION_EXECUTOR = Executors.newSingleThreadExecutor();

    public MmscInformation getMmscInfoForReceptionAck() {

        // Override this and provide the MMSC to send the ACK to.

        // some carriers will download duplicate MMS messages without this ACK. When using the

        // system sending method, apparently Google does not do this for us. Not sure why.

        // You might have to have users manually enter their APN settings if you cannot get them

        // from the system somehow.

    public MmscInformation getMmscInfoForReceptionAck(Context context) {

        SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);

        String mmsc_url = sharedPrefs.getString("mmsc_url", "");

        String mmsc_proxy = sharedPrefs.getString("mms_proxy", "");

        String mmsc_port = sharedPrefs.getString("mms_port", "");

        if (!mmsc_url.isEmpty() && !mmsc_proxy.isEmpty() && !mmsc_port.isEmpty()) {

            return new MmscInformation(mmsc_url, mmsc_proxy, Integer.parseInt(mmsc_port));

        }

        return null;

    }

            return null;

        }

        if (getMmscInfoForReceptionAck() == null) {

        if (getMmscInfoForReceptionAck(context) == null) {

            Timber.v("No MMSC information set, so no notification tasks will be able to complete");

            return null;

        }

        try {

            final NotificationInd ind = getNotificationInd(context, intent);

            final MmscInformation mmsc = getMmscInfoForReceptionAck();

            final MmscInformation mmsc = getMmscInfoForReceptionAck(context);

            final TransactionSettings transactionSettings = new TransactionSettings(mmsc.mmscUrl, mmsc.mmsProxy, mmsc.proxyPort);

            final List<CommonAsyncTask> responseTasks = new ArrayList<>();